Are you all using more �traditional� loading data from the past which is stouter than today�s publications present?
djb: Yes...since it has been years since I have loaded a 150 in the 270, I have not really looked at recent data,because I don't use the 150 anymore.The H4831 I refered to is the "old" stuff that O'Connor and those guys used,which I have always believed to be "slower" than present day 4831.
I agree with you that getting a bigger case is the way to get more velocity,but around 2900 fps is the "normal" velocity level for a 270 Winchester with a 150 gr bullet.That has been true for years now. Some barrels may take a grain or so more powder to get there,and this is not really unusual.
